68 ENTOMOLOGICAL NEWS [Mar., '22 



Group 4. Saturata Uhler. PI. IV, fig. 4. Montana and Texas 

 west to California and Baja California, occurring from sea-level up 

 to 5000 ft. 9 This is a vigorous form of open muddy ponds, cattail 

 swamps and sluggish streams. 



Croceipennis Selys. PI. IV, fig. 5. From sea-level in Texas and 

 Baja California, to 4000 ft. elevation in Costa Rica, occurring in 

 zones 3-4 of Calvert, but mainly in zone 4. Open swampy places 

 and sluggish streams. 10 



Herculea Karsch. PI. IV, fig. 6. Mexico to Ecuador and Para- 

 guay. The "Biologia" records are from Calvert's zones 3 and 4. 

 Usually found about brush piles in open muddy streams. 11 



Of this group, saturate! appears to be the only species that 

 can stand even light frosts. The other species occupy the Mex- 

 ican and Central American highlands, though Dr. Calvert states 

 in a letter that he found licrculca at Guacimo, Costa Rica, at 

 an elevation of less than 800 ft. The fact that this species has 

 reached South America across the low Isthmus, shows that it 

 can live also below the highlands. The climate of the Mexican 

 and Central American plateau corresponds to that of the south- 

 eastern United States, except that the occasional winter frosts 

 of the States are lacking. Because of the large number of 

 species of Libclhtla occupying the southern states and this 

 semitropical plateau, the climate of this region is probably the 

 optimum climate for the genus. 



This group has developed directly from the foliata stock of 

 the Central American highlands (zone 4 of Calvert). Prob- 

 ably the present distribution of foliata is less than in former 

 times as safurata, the most generalized species of group 4. has 

 a distribution north of and not in touch with the present habi- 

 tat of foliata. Dr. Calvert 12 describes individuals intermediate 

 between satnrafa and croccipcnnis. It would be interesting to 

 study the penes of these. 



Group 5. Julia Uhler. PI. IV, fig. 7. Maine to British Columbia. 

 A species of northern coniferous forest swamps. 



Exusta Say. PI. IV, fig. 8. Maine to Wisconsin, south to Indiana 

 and Ohio. A species of the deciduous forest. 



n The higher records from Wyoming, etc., are probably from warm 

 spring streams. 



10 In notes loaned by Dr. Calvert. 



11 Statements to the writer by E. B. and Jesse Williamson. 



12 B. C. A. Neur. 5 p. 211. 



